What type of sending unit does the fuel gauge use?
float
The sending unit usually uses a float connected to a potentiometer, typically printed ink design in a modern automobile. As the tank empties, the float drops and slides a moving contact along the resistor, increasing its resistance.
How does a fuel gauge sending unit work?
The fuel sending unit has a float arm that sits in the liquid gas. When that arm moves up and down, it changes the resistance to ground on a variable resistor. That resistance is then translated and sent through the car’s wiring and electronics to determine where the needle or digital gauge is positioned.
Where is the range adjustment on a VW fuel tank sending unit?
It is not uncommon for new fuel gauges to read at 1/4 or even 1/2 full at empty. There are 2 adjustments holes on the back of the fuel gauge, the range adjustment at the top, and the zero adjustment at the bottom. Both can be used along with the stops on the sending unit to adjust the gauge.
How to read ohms on a VW fuel gauge?
After removing the sending unit, set the unit on clean surface and connect the Ohm Meter leads to the tab connectors at the top of the sending unit. Be sure the meter batteries are good. You will need an ACCURATE reading on x1 scale. 3. Set the meter to read resistance (ohms) on the lowest scale available.
Where is the sending unit on a VW?
CAUTION: You are working with GASOLINE (a.k.a. Petrol). Always, work in a well ventilated area away from any source of open flame or spark. Sending Unit: The sending unit with floats is mounted to the top of the fuel tank.
Where does the wire from the fuel gauge come from?
� The wire (yellow?) that was connected to the gauge comes from the insulated tab on the sending unit. � The wire ( black?) that was connected to the side of the vibrator is switched 12 volts that comes with ignition ON.